Made by Kuntze

Kuntze Instruments manufactures both sensors and complete water quality measuring systems. We have been developing and producing redox electrodes since the 1950s. Our production capabilities increased in and 2013 with the opening of our state-of-the-art production facility in Hartha, Germany. Our 75+ years of experience in water quality measurements allows us to create measurement solutions to fit virtually any application.

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Measuring electrode

The measuring electrode of Redox sensors is typically made of platinum or gold. Kuntze uses only pure platinum and pure gold, no platinum or gold coatings. The measuring electrode can have different shapes.

  • Platinum or gold dome
    • A dome-shaped measuring electrode is our first choice. Domes are mechanically robust and can be cleaned easily.
  • Platinum or gold band
    • A platinum or gold band provides a large measuring surface, which can be helpful in applications where fouling is a challenge. Bands are more expensive due to their larger surface area and are mechanically less robust compared to a dome.


  • Zirkon® junction
    • Universal - fits most applications
    • Low electrolyte leakage and no refilling of electrolyte
    • Can be made with refillable electrolyte for low conductivity water, or with a protruding junction for special process control applications
  • Platinum or glass cut junction 
    • For ultrapure water with very low conductivity
    • Can be made with twisted platinum thread for high electrolyte leakage, ground glass joint for adjustable leakage, or three Zirkon® junctions for fixed leakage
  • Teflon junction or no junction at all
    • For heavily contaminated water
    • Robust and dirt resistant - Teflon junction with large surface area or open-hole junction in combination with hydrolysis-resistant solid electrolyte
  • Bridge electrolyte
    • For special applications
    • Double chamber sensors with two sequential junctions and separate electrolytes for optimal protection and maximum adaptability




  • S8 plug
    Two-poles S8 plug with rotatable, colored PG 13.5 thread.
  • Variopin plug
    Electrodes with integrated temperature sensor (Pt100 or Pt1000) have a variopin plug with PG13.5 thread (not rotatable).
  • Fixed Cable
    Alternatively, our electrodes can also be delivered with fixed cable, e.g. with BNC, DIN plug or free cable ends.